Swapping 93 carb to 88 GL1500


Information and questions on GL1500 Goldwings (1988-2000)
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MarkZ28
Posts: 23
Joined: Fri Sep 14, 2018 7:43 pm
Location: Timbuktu
Motorcycle: 1988 GL1500

Swapping 93 carb to 88 GL1500

Post by MarkZ28 »



Hello, Im swapping in a set of 93 carbs into my 88. From what I ujderstand, the 88 and 89 have an off idle stumble that was corrected on the newer carbs. My 88 carbs are crapped out anyway. Got a decent set off ebay for a 93. There are some differences that I can see. Vacuum lines are different but I can work around that. On the 88 there is a switch by the throttle arm where the cable attach. There is none on the 93. I will look at the online fsm I have to see what it is, but wondering if it is a bolt on swap? Looks to be. Also, in the pictures, the accelerator pump housing is different. The 88 kind of worked, the 93 didnt squirt anything when filling the bowls with spray carb cleaner. Im probably going to rebuild the accelerator pump either way, but is the bigger appearing 88 pump better than the smaller 93 pump?






































MarkZ28
Posts: 23
Joined: Fri Sep 14, 2018 7:43 pm
Location: Timbuktu
Motorcycle: 1988 GL1500

Re: Swapping 93 carb to 88 GL1500

Post by MarkZ28 »

Cruise control cancel switch. May not need it then if I cant get it swapped. Use the brake lever or turn it off manually.

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DenverWinger
Posts: 1533
Joined: Thu Jun 23, 2011 2:20 pm
Location: Denver, CO
Motorcycle: (s)
1980 GL1100 STD Vetter (2005-)
1993 GL1500 Aspencade (2017-)
1983 Trav-Lite Camper (2010-)
Past rides
1972 CL350 (1980-1988) sold
1978 Suzuki GS550 (1985-2005) sold
1977 GL1000 (2002-2006) sold

Re: Swapping 93 carb to 88 GL1500

Post by DenverWinger »

Quite a few differences between the years, might search out a '93 FSM too, this might help work out the differences in the vacuum connections.
♫ 99 Little Bugs in the Code, ♪
♪ 99 Bugs in the Code. ♫ :(
♫ Take one down, Patch it around, ♪
♫ 127 Little Bugs in the Code. ♫ ♪ :shock:

~Mark

MarkZ28
Posts: 23
Joined: Fri Sep 14, 2018 7:43 pm
Location: Timbuktu
Motorcycle: 1988 GL1500

Re: Swapping 93 carb to 88 GL1500

Post by MarkZ28 »

Vacuum lines look ok, should be able to make it work fine. Im more concerned with the accelerator pump, which is better? Bigger one have more volume of gas? Any advantage of one over the other? Ill order the rebuild kit for whichever one is the best.

User avatar
DenverWinger
Posts: 1533
Joined: Thu Jun 23, 2011 2:20 pm
Location: Denver, CO
Motorcycle: (s)
1980 GL1100 STD Vetter (2005-)
1993 GL1500 Aspencade (2017-)
1983 Trav-Lite Camper (2010-)
Past rides
1972 CL350 (1980-1988) sold
1978 Suzuki GS550 (1985-2005) sold
1977 GL1000 (2002-2006) sold

Re: Swapping 93 carb to 88 GL1500

Post by DenverWinger »

Accelerator pump is probably better on the "rich" side as opposed to too lean, lean causes stumbles (although overly rich can do that, too). I doubt the larger pump would be rich enough to drown the engine.

Have you tried mounting the '88 pump to the '93 carb to make sure it bolts up and linkages work?
♫ 99 Little Bugs in the Code, ♪
♪ 99 Bugs in the Code. ♫ :(
♫ Take one down, Patch it around, ♪
♫ 127 Little Bugs in the Code. ♫ ♪ :shock:

~Mark

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Snowmoer
Posts: 165
Joined: Fri Jan 25, 2013 12:23 pm
Location: Cedar City UT
Motorcycle: 2012 GL 1800
1977 GL 1000
2012 KLR 650

Re: Swapping 93 carb to 88 GL1500

Post by Snowmoer »

On your 88 carb, by switching the main jet from a 50 to a 55 will solve the stumble. You do not need to replace the whole carb. My bike did not get the recall done back in the day. I just switched the jets and it solved the problem. The bike had no stumble at all after the switch. The only other things to replace on your carb are the rubber parts. I did this on my 88 and the carbs are like new. Much easier than trying to retro fit a 90+ carb on the bike.

MarkZ28
Posts: 23
Joined: Fri Sep 14, 2018 7:43 pm
Location: Timbuktu
Motorcycle: 1988 GL1500

Re: Swapping 93 carb to 88 GL1500

Post by MarkZ28 »

No, havent tried to swap the pumps around. Looks like they will interchange fine, just one has a bigger bowl, which may or may not hold more fuel. Thats what Im trying to find out. Geuss I can take both off and see if theres any differences in volumes, or just has a different spring holder or whatever the reason one looks bigger.



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